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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
*{margin:0px;
padding:0px;}
#div1{width:830px; height:166px; margin:50px auto;
position:relative;
background:white;
overflow:hidden;}
#div1 ul li{float:left; width:174px; height:166px; list-style:none;
 }
 ul{position:absolute;}


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<script>
window.onload=function(){
	var oDiv=document.getElementById('div1');
	var oUl=oDiv.getElementsByTagName('ul')[0];
	var aLi=oUl.getElementsByTagName('li');
	var speed=3
	oUl.innerHTML=oUl.innerHTML+oUl.innerHTML;
	oUl.style.width=aLi[0].offsetWidth*aLi.length+'px';
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<body>
<a href="javascipt:;">向左走</a>
<a href="javascipt:;">向右走</a>
<div id="div1">
   <ul>
     <li><img src="images/b01.jpg" /></li>
     <li><img src="images/b02.jpg" /></li>
     <li><img src="images/b03.jpg" /></li>
     <li><img src="images/b04.jpg" /></li>
     <li><img src="images/b05.jpg" /></li>
   
   
   </ul>

</div>
</body>
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